TMZ has obtained The 911 call placed moments before Terrell Owens was rushed to an L.A. hospital for a possible pill overdose on October 6 — and according to Terrell's assistant, T.O. was trying to kill himself.

During the call, the dispatcher asks the assistant on the phone, "Was this a suicide attempt?" — and she responds, "Yes, I believe so."

While she was on the phone with the dispatcher, the woman claims T.O. was "talking to his girlfriend, ex-girlfriend … [I] don't really know what you wanna call it."
 

You can hear the 911 caller talking to his best friend Kita on another line.

T.O. was famously hospitalized back in 2006 for a similar incident — when he insisted he had a bad reaction to painkillers … despite reports he tried to commit suicide by swallowing 35 Vicodin pills.

T.O. later held a news conference on the matter and stated, "The rumor of me taking 35 pills, I think is absurd. I don't think I would be here if I had taken 35 pills."
 

T.O's rep declined to comment on the most recent episode.

Listen to the call here.